The best prices are (understandably) from the companies that don't hand over a wad of cash to the likes of confused.com. I'd say it's probably worth a shop around, as mine is now a fraction of what I paid last year, for an hour's work.
Mine was £185, minus £70 cashback from Quidco = £115.
Mine's identical to yours I think - 150 1.9D 16v manual Prestigio